Jack



D 29, 1931- c. L. ANDERSON ET AL 1,333,168

JACK

Filed Feb: 27, 1930 F INVENTOR.

& A TTORNEY.

Patented Dec. 29, if

NETED STATES CHARLES L. ANDERSON, OF AUGUSTA, AND GEORGE H. YOUNG, OF ELDORADO, KANSAS JACK Application filed February 27, 1930. Serial No. 431,745.

power than the ordinary jack of this type.

The increased power is provided by increasing the leverage on the actuating member which controls the dogs or pawls for operating the rack, it being understood that this invention has to do with pawl and rack operated jacks.

The novelty of the invention will be understood by reference to the following description in connection with the accompanying drawings in which:

Fig. 1 is a perspective View of a jack constructed in accordance with our lnvention.

Fig. 2 is a side elevation of the pawl operating mechanism, part of the slide being broken away to better illustrate the rack and pawl engagement and Fig. 3 is a similar view showing the levers in reverse position to that shown in Figure 2.

Referring now to the drawings by numerals of reference, 1 designates a rack having an undercut groove 2 on which moves. a slide 3. The slide carries an upstanding lever support 4 in which is pivoted a socket lever 5 carrying pawls or dogs 6 and 7. The socket lever receives an elongated lever handle grasped by the operator and moved back and forth to impart an intermittent movement to the slide 3 in a manner well understood. The invention thus far described is old and well known to oil rig men in the oil fields and only so much of the invention is shown as will enable those skilled in the art to understand the application of our invention.

Our invention consists in applying additional power for the socket lever 5 so that when the oints of drilling tools are frozen or diliicult to unscrew, additional power may be applied to the socket lever and therefore to the dogs to effect relative movement between the slide and the rack. In the ordinary jack, the lever support 4 terminates just above the trunnions or pivots 8 for the socket lever. We extend the support 4 upwardly to greater length to provide bearings 9 for a complementary socket lever 10 and we reenforce the support 4: by a corner web or fillet 11. The two socket levers 5 and 10 are then connected b two links 12 and 13 pivotally fastened to the socket lever 5 and 10 near the bottom of one socket lever and near the top of the other. The pivot 9 for the lever 10 is spaced from and above the pivot 8 for lever 5. Therefore, when a handle 14 is inserted in socket lever 10, power can be communicated to the socket lever 5 through the links 12 and 18 in excess of that which would be possible with the same length of lever received in socket 5. Ordinarily, it will be sufficient to apply the power to the jack through the socket lever 5 but whenever additional power is desired, the socket lever 10 will be employed.

It will be observed that the socket lever 10 has a small offset or shoulder 15 which will limit the outward movement of the socket lever by contacting with the edge 16 of the support 4. It will also be observed that the socket lever 10 carries a right angularly projecting elongated lug 17, the length of which is approximately the distance between the socket levers 5 and 10 when they are substantially parallel. Therefore, when the socket lever 10 is moved toward the socket lever 5, the lug 17 will come into contact with it and move it into dog or pawl shifting position. The forward movement of the socket lever 5 will be limited by contact of the lug 18 with the shoulder 19 on the arcuate brace 20.

When the handle 14: is moved in the direction of the arrow, Figure 2, the compound leverage provided by connecting the links 12 and 18 to a point near the fulcrum of the lever 10 and to the power end of lever 5 will exert greater force through the lever 5 than would be possible with the same length of handle 14 in socket member 5. It will be understood, of course, that the handle 14 is interchangeable in either the socket 5 or 10.

In actual practice, we have demonstrated that the invention is capable of exerting all of the force necessary to break frozen joints of drilling tools and that the power multiplying device may be brought into use only when desired.

YVhat we claim and desire to secure by Letters Patent is l. A ack including two members, one slideable upon the other, a socket lever carried by one of the members, means actuated by the socket lever to intermittently efiect movement between the two members, a second socket lever spaced from the first socket member and a link connected to the first socker lever near its upper end and to the second socket lever near its lower end,

2. A ack including two members, one slideable upon the other, a socket lever carried by one of the members, means actuated by the socket lever to intermittently effect movement between the two members, a second socket lever spaced from the first socket lever, a link connected to the first socket lever near its upper end and to the second socket lever near its lower end and an elongated lug carried by one of the socket levers near its upper end to limit the swinging movement of one socket lever with respect to the other.

3. A device of the class described comprising a rack, a slide on the rack, an upstanding support on the slide, a socket lever pivoted to the support near its base, pawls carried by the socket lever for intermittently engaging the rack, a socket lever carried by the upper end of the support and a link connected to the upper end of the first socket lever and to the second socket lever near its lower end.

4. A device of theclass described comprising arack, a slide on the rack, an upstanding support on the slide, a lever member piv oted to the support near its base, intermittently operated dogs carried by the lever member for engaging the rack, a lever member pivoted to the upper end of the lever support and a link connected to the upper end of the first named lever member and to the second lever member near its lower end. 5. A device of the class described comprising a rack, a slide on the rack, an upstanding support on the slide, a lever member pivoted to the support near its base, intermittently operated dogs carried by the lever member for engaging the rack, a lever member pivoted to the upper end of the lever support, a link connected to the upper end of the first named lever member and to the second lever member near its lower end, a stop member carried by the slide and a lug carried by the first lever member for engagement with the stop.

6. A device of the class descibed comprising a rack, a slide on the rack, an upstanding support on the slide, a lever member pivoted to the support near its base, intermittently operated dogs carried by the lever member for engaging the rack, a lever member pivoted to the upper end of the lever support, a link connected to the upper end second lever member near its lower end, a stop member carried by the slide, a lug carriedby the first lever member for engagement with the stop and a shoulder carried by the second lever member for engagement with the upper end of the support to limit the swinging movement o1 the second lever member in one direction.

7. A device of the class described comprising a rack, a slide on the rack, an upstanding support on the slide, a stop member on the slide, a pair of lever members pivoted to the support, one above the other, intermittently operating pawls carried by the lower lever member to engage the rack, a lug on the lower lever member to engage a shoulder, a lug carried by the upper lever member to engage the upper end of the lower lever member and a link connection between the upper end of the lower lever member and the lower end of the upper lever member.

In testimony whereof we aifix our signatures.

CHARLES L. ANDERSON. GEORGE H. YOUNG.

' of the first named lever member and to the I i 

